Merge branch 'maint'

* maint:
  Better advice on using topic branches for kernel development
  Documentation: update implicit "--no-index" behavior in "git diff"
  Documentation: expand 'git diff' SEE ALSO section
  Documentation: diff can compare blobs
  Documentation: gitrevisions is in section 7
  shell portability: no "export VAR=VAL"
  CodingGuidelines: reword parameter expansion section
  Documentation: update-index: -z applies also to --index-info
  Documentation: No argument of ALLOC_GROW should have side-effects

diff --combined Documentation/git-fast-import.txt
index 90a46665c93106ffb7976bb0bb49aea9b9debbf7,2c6ad5b2f32e6c0248f0a30423b07d01fed3baa3..5d0c245e38ff751d8c40a6eb6d5b17b80930d526
--- 1/Documentation/git-fast-import.txt
--- 2/Documentation/git-fast-import.txt
+++ b/Documentation/git-fast-import.txt
@@@ -439,7 -439,7 +439,7 @@@ Marks must be declared (via `mark`) bef
  * A complete 40 byte or abbreviated commit SHA-1 in hex.
  
  * Any valid Git SHA-1 expression that resolves to a commit.  See
-   ``SPECIFYING REVISIONS'' in linkgit:gitrevisions[1] for details.
+   ``SPECIFYING REVISIONS'' in linkgit:gitrevisions[7] for details.
  
  The special case of restarting an incremental import from the
  current branch value should be written as:
@@@ -524,9 -524,6 +524,9 @@@ start with double quote (`"`)
  If an `LF` or double quote must be encoded into `<path>` shell-style
  quoting should be used, e.g. `"path/with\n and \" in it"`.
  
 +Additionally, in `040000` mode, `<path>` may also be an empty string
 +(`""`) to specify the root of the tree.
 +
  The value of `<path>` must be in canonical form. That is it must not:
  
  * contain an empty directory component (e.g. `foo//bar` is invalid),

diff --combined Documentation/git-format-patch.txt
index df77474c2950d2a15145ac2bd086697fe365a192,a00b783fe5dd7a074fc70f9aed85e6e45189ac8f..9dcafc6d4442b6db66df642e92336537395b9919
--- 1/Documentation/git-format-patch.txt
--- 2/Documentation/git-format-patch.txt
+++ b/Documentation/git-format-patch.txt
@@@ -39,7 -39,7 +39,7 @@@ There are two ways to specify which com
     that leads to the <since> to be output.
  
  2. Generic <revision range> expression (see "SPECIFYING
-    REVISIONS" section in linkgit:gitrevisions[1]) means the
+    REVISIONS" section in linkgit:gitrevisions[7]) means the
     commits in the specified range.
  
  The first rule takes precedence in the case of a single <commit>.  To
@@@ -74,7 -74,7 +74,7 @@@ OPTION
  include::diff-options.txt[]
  
  -<n>::
 -      Limits the number of patches to prepare.
 +      Prepare patches from the topmost <n> commits.
  
  -o <dir>::
  --output-directory <dir>::

diff --combined git-am.sh
index 9317b3893552fda9d3e4cbdbd0c66bf69bd633a9,5f249485df230bed0d2a620104369260b0ac8b66..10436dcad56585774ee96ac3baadd04d5a151a84
--- 1/git-am.sh
--- 2/git-am.sh
+++ b/git-am.sh
@@@ -137,7 -137,7 +137,7 @@@ It does not apply to blobs recorded in 
      export GITHEAD_$his_tree
      if test -n "$GIT_QUIET"
      then
-           export GIT_MERGE_VERBOSITY=0
+           GIT_MERGE_VERBOSITY=0 && export GIT_MERGE_VERBOSITY
      fi
      git-merge-recursive $orig_tree -- HEAD $his_tree || {
            git rerere $allow_rerere_autoupdate
@@@ -444,12 -444,12 +444,12 @@@ els
                                set x
                                first=
                        }
 -                      case "$arg" in
 -                      /*)
 -                              set "$@" "$arg" ;;
 -                      *)
 -                              set "$@" "$prefix$arg" ;;
 -                      esac
 +                      if is_absolute_path "$arg"
 +                      then
 +                              set "$@" "$arg"
 +                      else
 +                              set "$@" "$prefix$arg"
 +                      fi
                done
                shift
        fi

diff --combined t/t5560-http-backend-noserver.sh
index 406432e7a5793a4c2ec464d2c44ea3fee99561d3,94f9d2e8e0790c22b9884cee4b668b8a6d408d99..0ad7ce07c4550ed28a22743a3c543e16f4d4c558
--- 1/t/t5560-http-backend-noserver.sh
--- 2/t/t5560-http-backend-noserver.sh
+++ b/t/t5560-http-backend-noserver.sh
@@@ -5,17 -5,16 +5,17 @@@ test_description='test git-http-backend
  
  HTTPD_DOCUMENT_ROOT_PATH="$TRASH_DIRECTORY"
  
 +test_have_prereq MINGW && export GREP_OPTIONS=-U
 +
  run_backend() {
        echo "$2" |
        QUERY_STRING="${1#*\?}" \
 -      GIT_PROJECT_ROOT="$HTTPD_DOCUMENT_ROOT_PATH" \
 -      PATH_INFO="${1%%\?*}" \
 +      PATH_TRANSLATED="$HTTPD_DOCUMENT_ROOT_PATH/${1%%\?*}" \
        git http-backend >act.out 2>act.err
  }
  
  GET() {
-       export REQUEST_METHOD="GET" &&
+       REQUEST_METHOD="GET" && export REQUEST_METHOD &&
        run_backend "/repo.git/$1" &&
        unset REQUEST_METHOD &&
        if ! grep "Status" act.out >act
@@@ -27,8 -26,8 +27,8 @@@
  }
  
  POST() {
-       export REQUEST_METHOD="POST" &&
-       export CONTENT_TYPE="application/x-$1-request" &&
+       REQUEST_METHOD="POST" && export REQUEST_METHOD &&
+       CONTENT_TYPE="application/x-$1-request" && export CONTENT_TYPE &&
        run_backend "/repo.git/$1" "$2" &&
        unset REQUEST_METHOD &&
        unset CONTENT_TYPE &&
@@@ -47,7 -46,7 +47,7 @@@ log_div() 
  . "$TEST_DIRECTORY"/t556x_common
  
  expect_aliased() {
-       export REQUEST_METHOD="GET" &&
+       REQUEST_METHOD="GET" && export REQUEST_METHOD &&
        if test $1 = 0; then
                run_backend "$2"
        else